Color television display system and method for reducing visibility of geometric pattern of colored-light sources, and method for fabrication thereof

Claim 1

In electronic color-image display apparatus comprising an array of similar adjacent groups of elements for producing intensity-modulatable observable colors, said groups extending throughout the image-display area, each of said elements in each of said groups being energizable to display light of a color differing from that displayed by one or more others of said elements in said group for producing an image for viewing from a viewing position in front of said array, said elements extending along lines generally parallel to each other thereby imparting a visually-observable line structure to said image, and means for energizing said elements sequentially along a direction transverse to said elements to an extent dependent upon the corresponding values of an image-brightness controlling signal, thereby to cause said array to produce said image, said groups recurring along said direction at intervals which are substantially one-half the spatial period, measured along said direction, of the highest-frequency component of the brightness variations in image content desired to be displayed, the improvement comprising: optical diffusing means positioned between said array and said viewing position for optically spreading the apparent location of the source of the light from said elements, the extent of said spreading along said transverse direction being substantially equal to or greater than said intervals of recurrence of said groups thereby to reduce substantially the visibility of said line structure at said viewing position, but insufficient to degrade substantially the display of said highest-frequency component.